This week has been a particularly brutal one for the people of Egypt. Following days of escalating bloodshed and spiralling unrest, supporters of ousted President Mohammed Morsi are accusing the military - which orchestrated his removal - of a massacre. At least 40 people were killed when troops opened fire on demonstrators near the Presidential Guards Club, in the eastern Nasr City district of the capital, where Morsi is believed to be in military custody.

Mutual recriminations followed, as demonstrators and some bystanders accused the army of firing at unarmed protesters, whilst the military accused "armed terrorists" of opening fire first. Others reported seeing plain-clothed "thugs" firing into the crowd.

Whatever the truth, a recently-surfaced video, publicised by the Middle East Media Research Institute (MEMRI), sheds light on the seething anger and sense of betrayal felt by supporters of Mohammed Morsi - and the degree to which they are willing to fight, violently if necessary, to reinstate Islamist rule in Egypt.

In the video, one man threatens Egyptian Defence Minister Abdul Fatah al-Sisi with suicide bombings. His words will do little to quiet the fears - both inside and outside of Egypt - that the current unrest could spawn further Islamist-inspired violence and terrorism, both in Egypt and potentially the wider region:

"You have created a new Taliban and a new Al Qaeda in Egypt... Restore things to what they were, or these masses will blow Egypt up..."

Then, an ultimatum which resonates particularly strongly in light of today's events: "Either you kill all these people, or they will blow up in your face."

In another clip, a female demonstrator issues a chilling warning to Egypt's Christian population, which largely supported Morsi's ouster.

"I just want to say one thing to the Christians: We are your neighbours. We will set you on fire."

Not long after the President was removed, Coptic Pope Tawdross II came out openly in support of the military, most likely hoping that its staunchly secular leadership would provide a less hostile environment for his community. The subsequent spike in anti-Christian violence will leave many Copts hoping that was not a tragic miscalculation.

Whether this bellicose rhetoric will translate into a full-scale armed uprising - as the Muslim Brotherhood has now called for - remains to be seen. But one thing seems abundantly clear: in the words of one angry protester: "We won’t back down."